Based on previous pump, much improved version. Bigger, better and wetter.
About this creation
XL-motor, protected with (almost) waterproof panels.
Pump case and gearings.
Using 21 tooth gear instead 15 tooth gear should give more pumping
but V2 leaked too, didnt even pump anything at first trial !
Redesigning and covering those gaps with tape help a lot. especially those lego panels leaks a lot. Inside pump i used tape to make upper half round and clean.
While old one pumped 4,0 liter/min, this one does 6,0 liter/min. And it does it with higher discharge-pipe.
XL-motor has power enough, but revving slowly, therefore it is upgeared to 9:1.
220 rpm * 9 = 1980 and with load 1200-1500rpm
But, I checked XL-motor performance. Using a voltage meter and a separate power supply I made some tests.
I found out, that lego power-supply and wires are too weak. XL-motor was running on 7,1 volts on motor end, which is too little. It is supposed to run with 9V.
So I used my own power supply and set voltage to 9,0 volts on motor end. On that voltage XL-motor takes 0,9 amps.
Result was 0,3 liters under 2 secs, makes about 9-10 liters/min, quite a achiement.
But i'm afraid of overheating ... 9 watts may be too much for XL.
But this proves that pump design is capable up to 10 liters/min.
Next trial was to try higher discharge pipe, 25 cm/10 inches. It does still 6L/min.
Pump case, perfectly round and smooth.
Upper half of chamber, covered with tape.
Water intake is shaped with those black wedges.
Pump in pieces.
Impeller running fast
BUt since these old type big gears are rare, i tried to make a modern version
Adjustable wing length
And running fast. Works fine and pumping even better, but requires more power.....
Pump core, see the intake wedge shape
And an Quad-pump, capable of pumping 25-40 liters/min !!
Final product will be a Gigantic Deca-pump, with 1+ Liter / second capacity !!
Just in case, if anyone needs this ;)
And because dull pictures don't show how this pump works, so enjoy my little wet video ;)